US4938300A - Weighing apparatus having multi-range motion transmitting levers - Google Patents

Weighing apparatus having multi-range motion transmitting levers Download PDF

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Publication number
US4938300A
US4938300A US07/426,167 US42616789A US4938300A US 4938300 A US4938300 A US 4938300A US 42616789 A US42616789 A US 42616789A US 4938300 A US4938300 A US 4938300A
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Prior art keywords
load
frame
weighing
motion
load receiving
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US07/426,167
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English (en)
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Peter Kunz
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Mettler Toledo GmbH Germany
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Mettler Instrumente AG
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Assigned to METTLER-TOLEDO AG (METTLER-TOLEDO SA) (METTLER-TOLEDO LTD), IM LANGACHER GREIFENSEE, SWITZERLAND reassignment METTLER-TOLEDO AG (METTLER-TOLEDO SA) (METTLER-TOLEDO LTD), IM LANGACHER GREIFENSEE, SWITZERLAND CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). NOVEMBER 24, 1989 Assignors: METTLER INSTRUMENTE AG
Assigned to METTLER-TOLEDO GMBH reassignment METTLER-TOLEDO GMBH CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: METTLER-TOLED AG
Assigned to METTLER-TOLEDO AG reassignment METTLER-TOLEDO AG CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: METTLER-TOLEDO GMBH
Assigned to METTLER-TOLEDO AG reassignment METTLER-TOLEDO AG RE-RECORD CHANGE OF NAME DOCUMENT TO CORRECT ASSIGNEE'S COUNTRY Assignors: METTLER-TOLEDO GMBH
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G21/00—Details of weighing apparatus
    • G01G21/24—Guides or linkages for ensuring parallel motion of the weigh-pans
    • G01G21/244—Guides or linkages for ensuring parallel motion of the weigh-pans combined with flexure-plate fulcrums

Definitions

  • This invention relates to weighing apparatus including multiple motion-transmitting levers for increasing the weighing range of a standard weighing apparatus having a first load receiving member connected by parallel spaced resilient guide means for movement relative to a frame upon which a weighing cell is mounted.
  • the invention is applicable to weighing systems of a type including a strain gauge means, oscillating string means, or electromagnetic load compensation means.
  • a scale having electromagnetic load compensation and double lever transmission is disclosed in the inventor's prior U.S. Pat. No. 4,184,556 (German Off. No. 2,844,336).
  • the inventor's prior patent Nos. 4,184,557 and 4,722,409 disclose weighing systems including parallel guide means for guiding a load receiving member relative to a stationary frame, and systems provided with electromagnetic load compensation, respectively.
  • Electromechanical weighing apparatus of this type are made in various mechanical models, using a standard weighing cell that is mass-produced and that is equipped with a corresponding number of transmission levers, depending upon the rated load.
  • a standard weighing cell that is mass-produced and that is equipped with a corresponding number of transmission levers, depending upon the rated load.
  • only the weighing cell can be made in large numbers of units in such a program, while, for the mechanical part of the scale, mostly different designs are used depending on the rated load of the scale, thereby leading to smaller numbers of units during mass production.
  • the point of application of the calibration weight to the scale is preferably at the place of the transmission of force between two transmission levers--i.e. at the place of attachment at the transmission lever that directly acts upon the weighing cell. Effect of the calibration weight on the weighing cell, in such a direct coupling of the weight to a transmission lever, depends on the position of the connected calibration weight relative to the longitudinal extent of the transmission lever. In order to obtain reliable calibration at all times, the length of the lever arm upon which the calibration weight takes effect must remain constant for a long time.
  • a common solution of these problems can be provided, in accordance with the present invention, by associating a parallel-guided load receiver with the motion-transmitting lever that acts directly upon the weighing cell.
  • the invention affords an improved scale concept which, in accordance with a preferred embodiment of the invention, consist of the fact that the transmission lever cooperating with the weighing cell and the load receiver associated with the latter are combined into one basic structural unit with the weighing cell, thereby representing an independent scale of low-weighted load which may be inserted into the remaining mechanical part of the scale to produce a higher rated load.
  • the basic or standard weighing apparatus can, within a given model series, represent the scale with the lowest rated load, and can be used in all higher load scales of the model series. This involves a more comprehensive structural unit than has been previously represented by the weighing cell alone. Mass production can, therefore, be extended to a larger material area than has been the case until now.
  • the coupling of the basic or standard unit which comprises the weighing cell to the series-connected motion-transmitting lever is not critical, because the correct force transmission does not depend on the position of the coupling point on the load receiver in the base unit.
  • the assembly of the scale is thus much simpler, and under certain circumstances, the basic unit can even be made as a slide-in unit, thereby simplifying the assembly of the scale.
  • a primary object of the present invention is to provide an improved weighing apparatus in which the load weighing range of a standard first weighing apparatus is increased by the use of additional or supplementary motion transmitting lever means as an attachment for the first weighing apparatus.
  • the first weighing apparatus includes a first frame, a first load-receiving support member connected with the first frame by parallel guide means, and a first motion-transmitting lever pivotally connected with the frame for transmitting the motion of the first load receiving member to a weighing cell device mounted on the first frame.
  • the first weighing means comprises a self-contained unit adapted for sliding insertion within a lateral opening contained in the second frame.
  • the first weighing means is supported on a platform portion of the second frame.
  • the 1-kg unit is produced by a basic 0.10 kg scale with a first supplementary unit, the 20 kg scale is produced by a 1 kg scale with a second supplementary unit, and the 600 kg scale results from a 20 kg scale with a third supplementary unit.
  • the 0.1 kg scale as well as the first and second supplementary units can be made as slide-in units which means that, during the assembly of the various units, each time no adjusting work will be needed; only the coupling members will have to be attached.
  • this building block principle one can make scale production more flexible and economical.
  • using a high-resolution weighing cell which may preferably work according to the principle of electromagnetic force compensation, plus using precisely working, durable transmission members, one can make high-resolution, broad-band scales having a high load rating.
  • the application point for the calibration weight is preferably on a load receiver, especially on the load receiver for the transmission lever that cooperates with the weighing cell. In this manner one can make sure that--in the same manner as in the load receiver for the weighing material--it is possible to apply the force into the transmission lever coupled to the load receiver independently of the position of the deposited weight. Any length changes with relation to the lever arm on which the calibration weight acts will thus not influence the calibration. Furthermore, the requirements for the accuracy of the connecting mechanism will be less high.
  • FIG. 1 is a somewhat diagrammatic sectional view of a self-contained first weighing apparatus
  • FIG. 2 is a somewhat diagrammatic sectional view of a first embodiment of the invention in which the self-contained weighing apparatus of FIG. 1 is mounted within the frame which supports the second load receiving member;
  • FIG. 3 is a generally diagrammatic sectional view illustrating a second embodiment of the invention.
  • FIG. 4 is a sectional view taken along the line 4--4 of FIG. 2;
  • FIG. 5 is a sectional view taken along the line 5--5 in FIG. 3.
  • the weighing apparatus of the present invention includes a self-contained first weighing system 1 having a housing and including a rigid frame 2 to which a first load receiving member 5 is connected for vertical movement by parallel spaced upper and lower resilient guide members 3 and 4, respectively, as is known in the art.
  • a motion-transmitting lever 7 Pivotally supported intermediate its ends from the rigid frame 2 by flexible bearing means 8 is a motion-transmitting lever 7, one end of which is connected with the first load receiving member 5 by a flexible bearing 6.
  • the lever 7 is associated with a position measuring device 12 (for example, a photoelectric cell) that supplies an input to position signal generator means 40.
  • the weighing apparatus is of the known electromagnetic load compensation type including stationary permanent magnet means 10 connected with the frame 2, and a movable coil member 11 connected with the motion-transmitting lever 7.
  • the position signal generating means controls the operation of electromagnetic load compensation means 42 for supplying compensating current to the coil 11, thereby to maintain the load receiving member 5 in its initial no-load position, the magnitude of the compensating current being a measure of the magnitude of the applied load, as indicated on the load indicating means 44.
  • the self-contained weighing apparatus of FIG. 1 has a given load rating which is, among others, a function of the length of the motion transmitting lever 7.
  • the weighing apparatus of FIG. 1 is suitable for use as an independent scale having a low load rating and higher resolution, and is known in the art.
  • a parallel-guided load receiver 5 that is associated with a transmission lever 7 which cooperates with a weighing cell 9; such a receiver has not been considered necessary.
  • the additional leverage is directly coupled with the transmission lever 7 which operates on the weighing cell 9, as shown, for example, in FIG. 4 of the U.S. Pat. No. 4,184,557 wherein an electromagnetic scale includes double transmission lever means.
  • a second rigid frame member 13 containing a lateral opening 13a that receives the weighing apparatus 1 of FIG. 1, as shown in phantom.
  • the first load receiving means 5 extends outwardly from one end of the housing 1.
  • a second load receiving member 16 which is connected for vertical guided movement relative to the second frame 13 by resilient upper and lower guide members 14 and 15, respectively.
  • Pivotally connected at one end with the second frame 13 by flexible support bearings 19 is a second motion-transmitting lever 17 that is bifurcated to define a pair of arm portions 17a and 17b, and a pair of transverse end portions 18 and 22.
  • the second motion-transmitting lever 17 is connected at its other end with the first load receiving member 5 by flexible bearing 21 that is connected with the transverse portion 22 of the second lever 17.
  • the second load receiving member 16 is suspended from an intermediate portion of the lever 17 by flexible suspension bearing means 20.
  • the first weighing means 1 is slidably received within the lateral opening 13a of the second frame means 13, whereby owing to the presence of the motion transmitting lever 17, the resultant combined instrument has a higher load rating for receiving the load F applied to the second load receiving member 16, than the first weighing means 1 of FIG. 1 alone.
  • a calibrating weight 23 may be applied directly to the first load receiving member 5 independently of the second load receiving member 16 that actually receives the load to be measured F.
  • the first weighing apparatus 32 is provided with a first load receiving member 33 that projects from one end of the associated housing.
  • the second load receiving means 28 is connected for vertical movement relative to the frame 25 by parallel spaced upper and lower resilient guide members 26 and 27, respectively, the frame being provided with a horizontal base portion 24 that supports the self-contained first weighing apparatus 32 in a position in alignment with the guide members 26 and 27, and on the opposite side of frame 25 from the second load receiving member 28.
  • the second motion-transmitting lever 30 is suspended at one end by flexible bearing means 31 from the second frame 25, and at its other end the second motion-transmitting lever 30 is connected with the first load receiving member 33 by the flexible bearing means 34.
  • the motion-transmitting lever 30 is connected with the second load-receiving member 28 by flexible bearing means 29.
  • the second motion-transmitting lever means 30 is bifurcated to define a pair of arm portions 30a and 30b that are arranged on opposite sides of the first weighing apparatus 32, the transverse end portions 30c and 30d being associated with the suspension bearing means 31 and 34, respectively.
  • the combined multi-lever weighing apparatus has a higher load rating for the application of loads F to the second load receiving member 28 than that of the first weighing means 32, owing to the presence of the motion transmitting lever 30.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Force In General (AREA)
  • Weight Measurement For Supplying Or Discharging Of Specified Amounts Of Material (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Mechanical Control Devices (AREA)
US07/426,167 1988-11-15 1989-10-25 Weighing apparatus having multi-range motion transmitting levers Expired - Lifetime US4938300A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4238 1988-11-15
CH4238/88A CH675913A5 (fr) 1988-11-15 1988-11-15

Publications (1)

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US4938300A true US4938300A (en) 1990-07-03

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US07/426,167 Expired - Lifetime US4938300A (en) 1988-11-15 1989-10-25 Weighing apparatus having multi-range motion transmitting levers

Country Status (5)

Country Link
US (1) US4938300A (fr)
EP (1) EP0369136B1 (fr)
JP (1) JPH084575Y2 (fr)
CH (1) CH675913A5 (fr)
DE (2) DE58903346D1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5082073A (en) * 1989-11-02 1992-01-21 Sartorius Ag Electronic balance with parallel guide and scale on top
US5092416A (en) * 1990-03-14 1992-03-03 Mettler - Toledo Ag Weighing apparatus with adjustable crossbar support
US5856638A (en) * 1996-07-19 1999-01-05 Mettler-Toledo Gmbh Weighing apparatus having temperature-modified electromagnetic compensation means
US6374682B1 (en) * 1998-12-23 2002-04-23 Mettler-Toledo Gmbh Force-measuring apparatus, particularly a weighing cell I
US20050023047A1 (en) * 2003-07-28 2005-02-03 Shimadzu Corporation Weight measuring device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4119734A1 (de) * 1991-06-14 1992-12-17 Mettler Toledo Ag Vorrichtung zur kraftuntersetzung in einer kraftmesseinrichtung, insbesondere einer waage
DE4401412C2 (de) * 1994-01-19 1996-06-27 Sartorius Gmbh Waage mit Kraftuntersetzung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3299977A (en) * 1965-04-07 1967-01-24 Butler Bin Company Dual range weighing scale
US4184557A (en) * 1978-03-08 1980-01-22 Mettler Instrumente Ag Top loading balance
US4184556A (en) * 1977-12-06 1980-01-22 Mettler Instrumente Ag Balance with electromagnetic compensation
US4711314A (en) * 1984-08-20 1987-12-08 Tokyo Electric Co., Ltd. Multi-range load cell weighing scale
US4722409A (en) * 1986-06-06 1988-02-02 Peter Kunz Compact weighing apparatus of the electromagnetic load compensation type
US4778016A (en) * 1985-09-17 1988-10-18 Tokyo Electric Co., Ltd. Weighing method by multirange load cell balance

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH591684A5 (en) * 1976-04-01 1977-09-30 Mettler Instrumente Ag Wide range top pan electromagnetic weigher - has variable ratio lever in parallel guide which permits range alteration
JPS59159025A (ja) * 1983-02-28 1984-09-08 Shimadzu Corp スパン較正用負荷装置付はかり
CH661121A5 (en) * 1983-05-27 1987-06-30 Mettler Instrumente Ag Electromechanical balance with a lever mechanism and with a connectable calibrating weight
JPS6196422A (ja) * 1984-10-17 1986-05-15 Tokyo Electric Co Ltd マルチレンジロ−ドセル秤

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3299977A (en) * 1965-04-07 1967-01-24 Butler Bin Company Dual range weighing scale
US4184556A (en) * 1977-12-06 1980-01-22 Mettler Instrumente Ag Balance with electromagnetic compensation
US4184557A (en) * 1978-03-08 1980-01-22 Mettler Instrumente Ag Top loading balance
US4711314A (en) * 1984-08-20 1987-12-08 Tokyo Electric Co., Ltd. Multi-range load cell weighing scale
US4778016A (en) * 1985-09-17 1988-10-18 Tokyo Electric Co., Ltd. Weighing method by multirange load cell balance
US4722409A (en) * 1986-06-06 1988-02-02 Peter Kunz Compact weighing apparatus of the electromagnetic load compensation type

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5082073A (en) * 1989-11-02 1992-01-21 Sartorius Ag Electronic balance with parallel guide and scale on top
US5092416A (en) * 1990-03-14 1992-03-03 Mettler - Toledo Ag Weighing apparatus with adjustable crossbar support
US5856638A (en) * 1996-07-19 1999-01-05 Mettler-Toledo Gmbh Weighing apparatus having temperature-modified electromagnetic compensation means
US6374682B1 (en) * 1998-12-23 2002-04-23 Mettler-Toledo Gmbh Force-measuring apparatus, particularly a weighing cell I
US20050023047A1 (en) * 2003-07-28 2005-02-03 Shimadzu Corporation Weight measuring device
US7076990B2 (en) * 2003-07-28 2006-07-18 Shimadzu Corporation Load cell type weight measuring device

Also Published As

Publication number Publication date
EP0369136B1 (fr) 1993-01-20
DE58903346D1 (de) 1993-03-04
JPH0269725U (fr) 1990-05-28
DE8911340U1 (de) 1990-03-15
EP0369136A3 (fr) 1991-07-10
CH675913A5 (fr) 1990-11-15
EP0369136A2 (fr) 1990-05-23
JPH084575Y2 (ja) 1996-02-07

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